I think that taking legal-fees contributions from abroad, should be illegal.
That even apart from Yaxley-Lennon's case. Y-L is a useless, anti-British, vain tuppeny-ha'penny, really only a blasted nuisance who has yet to grow up.
Musk though is far more dangerous due to having taken over Twitter to push his own politics, his being part of Trump's coterie, and his trying to undermine foreign countries from the safety of his own. A South African emigrant to America, he despises the UK and has already tried to foment trouble here; presumably for his own ends. I am not clear what those are though, nor am I sure he has even his own adopted country's interests at heart.